Listener on dispatch instead of render

[chielsen]

Listener on dispatch instead of render

[fabiang]

Hello,

thank you for pointing this out.

As far as I can see it's important for the check for acceptable errors. This and the priority of 32 comes from the original fork. Without further testing I assume the event listener could be changed to the events MvcEvent::EVENT_RENDER and MvcEvent::EVENT_RENDER_ERROR, since the error should be available too there.

Honestly this library, while still supported by me, is very low on my priority list, as there are better solutions out there for managing assets. So if you willing to do further investigations and open a pull request, I'm happy to merge the solution.